Abaqus Basics Simulation Abaqus Standard Output file Jobodb jobdat Postprocessing Abaqus CAE Preprocessing Abaqus CAE Interactive Mode Analysis Input file Input file text Jobinp ID: 1025512
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1. Tutorial 2: Abaqus with Analysis Input File
2. Abaqus BasicsSimulationAbaqus/StandardOutput file:Job.odb, job.datPostprocessingAbaqus/CAEPreprocessingAbaqus/CAEInteractive ModeAnalysis Input fileInput file (text):Job.inpFEM Solver
3. Why do I go with input files?Analysis with input filesABAQUS solver reads the analysis input fileAdvantage: User can change model directly without GUIFASTER than analysis using GUIUseful for minor modification (GUI automatically create an input file)Disadvantage: No visual information (should use GUI to check model layout)User has to discretize model
4. Input File: frame.inp*HEADINGTwo-dimensional overhead hoist frameSI units (kg, m, s, N)1-axis horizontal, 2-axis vertical*PREPRINT, ECHO=YES, MODEL=YES, HISTORY=YES**** Model definition***NODE, NSET=NALL101, 0., 0., 0.102, 1., 0., 0.103, 2., 0., 0.104, 0.5, 0.866, 0.105, 1.5, 0.866, 0.*ELEMENT, TYPE=T2D2, ELSET=FRAME11, 101, 10212, 102, 10313, 101, 10414, 102, 10415, 102, 10516, 103, 10517, 104, 105*SOLID SECTION, ELSET=FRAME, MATERIAL=STEEL** diameter = 5mm --> area = 1.963E-5 m^21.963E-5,*MATERIAL, NAME=STEEL*ELASTIC200.E9, 0.3Truss elementSolid sectionElastic material
5. Input File: frame.inp**** History data***STEP, PERTURBATION10kN central load*STATIC*BOUNDARY101, ENCASTRE103, 2*CLOAD102, 2, -10.E3*NODE PRINTU,RF,*EL PRINTS,************************************ OUTPUT FOR ABAQUS QA PURPOSES***********************************EL FILES,*NODE FILEU, RF*END STEPTruss elementSolid sectionElastic materialCLOADPERTURBATION STATIC
6. Input File: frame.inp*HEADINGTwo-dimensional overhead hoist frameSI units (kg, m, s, N)1-axis horizontal, 2-axis vertical*PREPRINT, ECHO=YES, MODEL=YES, HISTORY=YES**** Model definition***NODE, NSET=NALL101, 0., 0., 0.102, 1., 0., 0.103, 2., 0., 0.104, 0.5, 0.866, 0.105, 1.5, 0.866, 0.*ELEMENT, TYPE=T2D2, ELSET=FRAME11, 101, 10212, 102, 10313, 101, 10414, 102, 10415, 102, 10516, 103, 10517, 104, 105*SOLID SECTION, ELSET=FRAME, MATERIAL=STEEL** diameter = 5mm --> area = 1.963E-5 m^21.963E-5,*MATERIAL, NAME=STEEL*ELASTIC200.E9, 0.3**** History data***STEP, PERTURBATION10kN central load*STATIC*BOUNDARY101, ENCASTRE103, 2*CLOAD102, 2, -10.E3*NODE PRINTU,RF,*EL PRINTS,************************************ OUTPUT FOR ABAQUS QA PURPOSES***********************************EL FILES,*NODE FILEU, RF*END STEP
7. Format of Input FileModel data sectionInformation required to define the structure being analyzedHistory data sectionType of simulation (static, dynamics, etc)The sequence of loading or events for which the response of the structure is requiredDivided into a sequence of stepsOutput requestInput fileComposed of a number of option blocks (describing a part of the model) Each option block begins with a keyword line (starting with *), which is usually followed by one or more data lines.Description for the data lines (starting with **)
8. Format of Input File cont.Keyword line*ELEMENT, TYPE = T2D2, ELSET = FRAMEElement set FRAME is 2-dimensional truss element*NODE, NSET=PART1All nodes below belong to a set PART1*ELEMENT, TYPE = T2D2, ELSET = FRAMEMaximum 256 characters per line
9. Format of Input File cont.Data line - Keyword line usually followed by data lines*NODE101, 0., 0., 0.102, 1., 0., 0.103, 2., 0., 0.104, 0.5, 0.866, 0.105, 1.5, 0.866, 0.101102103104105
10. Format of Input File cont.*ELEMENT11, 101, 10212, 102, 10313, 101, 10414, 102, 10415, 102, 10516, 103, 10517, 104, 10510110210310410512111314151617
11. Format of Input File cont.Model dataHeadingThe first option in any Abaqus input file must be *HEADINGDescription of the problem*HEADINGTwo-dimensional overhead hoist frameSI units (kg, m, s, N)1-axis horizontal, 2-axis verticalData file printing optionsInput file echo*PREPRINT, ECHO=YES, MODEL=YES, HISTORY=YESComments**** Model definition**
12. Format of Input File cont.Element connectivityKeyword *ELEMENT specifies element type, element set*ELEMENT, TYPE=T2D2, ELSET=FRAME 11, 101, 102 12, 102, 103 13, 101, 104 14, 102, 104 15, 102, 105 16, 103, 105 17, 104, 105Section propertiesKeyword *SOLID SECTION specifies area, I, etc*SOLID SECTION, ELSET=FRAME, MATERIAL=STEEL** diameter = 5mm --> area = 1.963E-5 m^21.963E-5,
13. Format of Input File cont.Material propertiesKeyword *MATERIAL followed by various suboptions*MATERIAL, NAME=STEEL *ELASTIC 200.E9, 0.3History dataStarts with keyword *STEP, followed by the title of the step*STEP, PERTURBATION 10kN central loadAnalysis procedureUse *STATIC immediately after *STEPBoundary conditionsKeyword *BOUNDARY(UX, UY, UZ, UR1, UR2, URS) = (1, 2, 3, 4, 5, 6)
14. Format of Input File cont.Boundary conditions cont.Format: Node number, first dof, last dof, displ value103, 2,2, 0.0103, 2,2103, 2101, 1101, 2Built in constraintsENCASTRE: Constraint on all displacements and rotations at a node PINNED: Constraint on all translational degrees of freedomXSYMM: Symmetry constraint about a plane of constant YSYMM: Symmetry constraint about a plane of constantZSYMM: Symmetry constraint about a plane of constantXASYMM: Antisymmetry constraint about a plane of constantYASYMM: Antisymmetry constraint about a plane of constantZASYMM: Antisymmetry constraint about a plane of constant
15. Format of Input File cont.Applied loadsconcentrated loads, pressure loads, distributed traction loads, distributed edge loads and moment on shells, nonzero boundary conditions, body loads, and temperature*CLOAD 102, 2, -10.E3Output requestneutral binary file (.odb), printed text file (.dat), restart file (.res), binary result file (.fil)*EL PRINTS, E*NODE PRINTU,RF,End of step*END STEP
16. Modifying Input FileMultiple Sections (FRAME1 and FRAME2)Assign new section to element 6*ELEMENT, TYPE=T2D2, ELSET=FRAME111, 101, 10212, 102, 10313, 101, 10414, 102, 10415, 102, 10516, 103, 105*ELEMENT, TYPE=T2D2, ELSET=FRAME217, 104, 105*SOLID SECTION, ELSET=FRAME1, MATERIAL=STEEL** diameter = 5mm --> area = 1.963E-5 m^21.963E-5,*SOLID SECTION, ELSET=FRAME2, MATERIAL=STEEL2.0E-5,
17. Modifying Input File (Made by ABAQUS)Input files made by GUIFind the files in the work directory(to check where the directory is: Files > Set Work Directory)Automatically made by GUI when users submit a model(ex: [Jobname].inp)Edit the existing input file
18. Run ABAQUSUsing Abaqus/CAEImport the input model Advantage: visually check FEM modelDisadvantage: A couple of commands do not work (ex: text out request commands)
19. Run ABAQUSUsing Command PromptData checkabaqus job=frame datacheck interactiveCheck for **ERROR or **WARNINGSolving the problemabaqus job=frame continue interactiveShow frame.dat file
20. Run ABAQUSBasic commands in command promptcd [directory name] : change directory to new directory(ex: cd test)cd / : change directory to root at oncedir : see available files in current directory
21. Batch TestRunning many jobsUseful to run many jobs at the same timeCreate a batch file (ex: multirun.bat)Making a batch fileMake an empty text file and write a list of filesChange the file name and extension(ex: newname.txt -> multirun.bat)(abaqus job=frame-1 interactiveabaqus job=frame-2 interactiveabaqus job=frame-3 interactiveabaqus job=frame-4 interactive)